关于后端传递的json,怎么用layui前端获取到此集合

代码如下：

@RequestMapping("/add")
    public JSONArray add() {
        System.out.println("进入Student_controller_add");
        Map map = new HashMap();
        List<Teacher_Course> all = studentService.getAll();
        System.out.println("List对象的值:"+all);
        map.put("result", all);
        map.put("totla", all.size());
        map.put("msg", "这是数据传来的！");
        map.put("code",200);
//        String result = JSON.toJSONString(map);
//        System.out.println("方案一：" + result);

        JSONArray jsonArray = new JSONArray();
        jsonArray.add(map);
        System.out.println("方案二：" + jsonArray.toJSONString());

        return jsonArray;
    }

控制台输出的json如下：

List对象的值:[Teacher_Course(tid=null, tname=li, tphone=null, tpwd=null, cno=tx20210909, cnum=tx20210909.2018240206, cname=操作系统, ctype=专业课, cdept=信息学院, ctno=null, cyear=2021, cterm=1, cclass=2018240206, cgrade=null)]
方案二：[{"result":[{"cclass":"2018240206","cdept":"信息学院","cname":"操作系统","cno":"tx20210909","cnum":"tx20210909.2018240206","cterm":1,"ctype":"专业课","cyear":"2021","tname":"li"}],"msg":"这是数据传来的！","code":200,"totla":1}]

请问，怎么在前端获取json的值，谢谢！